We have a Seneca 36FK as well and bought an Empire cover (www.empirecovers.com). Our coach spent the bulk of last winter in the shop, so we haven't used the cover much. It seems to be high quality, bit we'll see how it holds up this winter.
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Ty & Deb Montag
Columbus, OH
2015 Jayco Seneca 36FK
2014 Honda CR-V toad